Pre-gauge theory of weak interactions

1 Field theory and pre-gauge theory of weak interactions 

Further details, in particular the rules for calculating Feynman diagrams in QED, QCD and in weak interactions, are given in Appendix 2. For a complete treatment the reader is referred to Bjorken and Drell (1964, 1965) and Itzykson and Zuber (1980). 

After many years of effort, and many false starts, it was concluded in the mid-1950s that all of weak interaction phenomenology could be described by the Fermi Lagrangian 

The Fermi Lagrangian then gives rise to three types of weak process (all of a point-like nature since interactions only take place when all the particles are at the same point)  

The vectorial and spin structure of the leptonic current is of the V — A form V = vector, A = axial vector) 

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